Potential SAM Database Dump — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2022-02-11 / 2023-01-05.

{
  "product": "windows",
  "category": "file_event"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: bf6eb68d113c3a0caf1516cdb6055d5a32f441c5a8e7e52f7cd9ee54655b18fa

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Potential SAM Database Dump
id: 4e87b8e2-2ee9-4b2a-a715-4727d297ece0
status: test
description: Detects the creation of files that look like exports of the local SAM (Security Account Manager)
references:
    - https://github.com/search?q=CVE-2021-36934
    - https://web.archive.org/web/20210725081645/https://github.com/cube0x0/CVE-2021-36934
    - https://www.google.com/search?q=%22reg.exe+save%22+sam
    - https://github.com/HuskyHacks/ShadowSteal
    - https://github.com/FireFart/hivenightmare
author: Florian Roth (Nextron Systems)
date: 2022-02-11
modified: 2023-01-05
tags:
    - attack.credential-access
    - attack.t1003.002
logsource:
    product: windows
    category: file_event
detection:
    selection:
        - TargetFilename|endswith:
              - '\Temp\sam'
              - '\sam.sav'
              - '\Intel\sam'
              - '\sam.hive'
              - '\Perflogs\sam'
              - '\ProgramData\sam'
              - '\Users\Public\sam'
              - '\AppData\Local\sam'
              - '\AppData\Roaming\sam'
              - '_ShadowSteal.zip'       # https://github.com/HuskyHacks/ShadowSteal
              - '\Documents\SAM.export'  # https://github.com/n3tsurge/CVE-2021-36934/
              - ':\sam'
        - TargetFilename|contains:
              - '\hive_sam_'             # https://github.com/FireFart/hivenightmare
              - '\sam.save'
              - '\sam.export'
              - '\~reg_sam.save'
              - '\sam_backup'
              - '\sam.bck'
              - '\sam.backup'
    condition: selection
falsepositives:
    - Rare cases of administrative activity
level: high

Original YAML and metadata in JSON

False positives

• Rare cases of administrative activity

Source references

• https://github.com/search?q=CVE-2021-36934
• https://web.archive.org/web/20210725081645/https://github.com/cube0x0/CVE-2021-36934
• https://www.google.com/search?q=%22reg.exe+save%22+sam
• https://github.com/HuskyHacks/ShadowSteal
• https://github.com/FireFart/hivenightmare